/* $NetBSD: filecomplete.c,v 1.15 2009/02/16 00:15:45 christos Exp $ */ /*- * Copyright (c) 1997 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jaromir Dolecek. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* AIX requires this to be the first thing in the file. */ #if defined (_AIX) && !defined (__GNUC__) #pragma alloca #endif #include #ifdef __GNUC__ # undef alloca # define alloca(n) __builtin_alloca (n) #else # ifdef HAVE_ALLOCA_H # include # else # ifndef _AIX extern char *alloca (); # endif # endif #endif #if !defined(lint) && !defined(SCCSID) __RCSID("$NetBSD: filecomplete.c,v 1.15 2009/02/16 00:15:45 christos Exp $"); #endif /* not lint && not SCCSID */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "el.h" #include "fcns.h" /* for EL_NUM_FCNS */ #include "histedit.h" #include "filecomplete.h" static char break_chars[] = { ' ', '\t', '\n', '"', '\\', '\'', '`', '@', '$', '>', '<', '=', ';', '|', '&', '{', '(', '\0' }; /********************************/ /* completion functions */ /* * does tilde expansion of strings of type ``~user/foo'' * if ``user'' isn't valid user name or ``txt'' doesn't start * w/ '~', returns pointer to strdup()ed copy of ``txt'' * * it's callers's responsibility to free() returned string */ char * fn_tilde_expand(const char *txt) { struct passwd pwres, *pass; char *temp; size_t len = 0; char pwbuf[1024]; if (txt[0] != '~') return (strdup(txt)); temp = strchr(txt + 1, '/'); if (temp == NULL) { temp = strdup(txt + 1); if (temp == NULL) return NULL; } else { len = temp - txt + 1; /* text until string after slash */ temp = malloc(len); if (temp == NULL) return NULL; (void)strncpy(temp, txt + 1, len - 2); temp[len - 2] = '\0'; } if (temp[0] == 0) { #ifdef HAVE_GETPW_R_POSIX if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf), &pass) != 0) pass = NULL; #elif HAVE_GETPW_R_DRAFT pass = getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf)); #else pass = getpwuid(getuid()); #endif } else { #ifdef HAVE_GETPW_R_POSIX if (getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf), &pass) != 0) pass = NULL; #elif HAVE_GETPW_R_DRAFT pass = getpwnam_r(temp, &pwres, pwbuf, sizeof(pwbuf)); #else pass = getpwnam(temp); #endif } free(temp); /* value no more needed */ if (pass == NULL) return (strdup(txt)); /* update pointer txt to point at string immedially following */ /* first slash */ txt += len; temp = malloc(strlen(pass->pw_dir) + 1 + strlen(txt) + 1); if (temp == NULL) return NULL; (void)sprintf(temp, "%s/%s", pass->pw_dir, txt); return (temp); } /* * return first found file name starting by the ``text'' or NULL if no * such file can be found * value of ``state'' is ignored * * it's caller's responsibility to free returned string */ char * fn_filename_completion_function(const char *text, int state) { static DIR *dir = NULL; static char *filename = NULL, *dirname = NULL, *dirpath = NULL; static size_t filename_len = 0; struct dirent *entry; char *temp; size_t len; if (state == 0 || dir == NULL) { temp = strrchr(text, '/'); if (temp) { char *nptr; temp++; nptr = realloc(filename, strlen(temp) + 1); if (nptr == NULL) { free(filename); return NULL; } filename = nptr; (void)strcpy(filename, temp); len = temp - text; /* including last slash */ nptr = realloc(dirname, len + 1); if (nptr == NULL) { free(filename); return NULL; } dirname = nptr; (void)strncpy(dirname, text, len); dirname[len] = '\0'; } else { if (*text == 0) filename = NULL; else { filename = strdup(text); if (filename == NULL) return NULL; } dirname = NULL; } if (dir != NULL) { (void)closedir(dir); dir = NULL; } /* support for ``~user'' syntax */ free(dirpath); if (dirname == NULL && (dirname = strdup("./")) == NULL) return NULL; if (*dirname == '~') dirpath = fn_tilde_expand(dirname); else dirpath = strdup(dirname); if (dirpath == NULL) return NULL; dir = opendir(dirpath); if (!dir) return (NULL); /* cannot open the directory */ /* will be used in cycle */ filename_len = filename ? strlen(filename) : 0; } /* find the match */ while ((entry = readdir(dir)) != NULL) { /* skip . and .. */ if (entry->d_name[0] == '.' && (!entry->d_name[1] || (entry->d_name[1] == '.' && !entry->d_name[2]))) continue; if (filename_len == 0) break; /* otherwise, get first entry where first */ /* filename_len characters are equal */ if (entry->d_name[0] == filename[0] /* Some dirents have d_namlen, but it is not portable. */ && strlen(entry->d_name) >= filename_len && strncmp(entry->d_name, filename, filename_len) == 0) break; } if (entry) { /* match found */ /* Some dirents have d_namlen, but it is not portable. */ len = strlen(entry->d_name); temp = malloc(strlen(dirname) + len + 1); if (temp == NULL) return NULL; (void)sprintf(temp, "%s%s", dirname, entry->d_name); } else { (void)closedir(dir); dir = NULL; temp = NULL; } return (temp); } static const char * append_char_function(const char *name) { struct stat stbuf; char *expname = *name == '~' ? fn_tilde_expand(name) : NULL; const char *rs = " "; if (stat(expname ? expname : name, &stbuf) == -1) goto out; if (S_ISDIR(stbuf.st_mode)) rs = "/"; out: if (expname) free(expname); return rs; } /* * returns list of completions for text given * non-static for readline. */ char ** completion_matches(const char *, char *(*)(const char *, int)); char ** completion_matches(const char *text, char *(*genfunc)(const char *, int)) { char **match_list = NULL, *retstr, *prevstr; size_t match_list_len, max_equal, which, i; size_t matches; matches = 0; match_list_len = 1; while ((retstr = (*genfunc) (text, (int)matches)) != NULL) { /* allow for list terminator here */ if (matches + 3 >= match_list_len) { char **nmatch_list; while (matches + 3 >= match_list_len) match_list_len <<= 1; nmatch_list = realloc(match_list, match_list_len * sizeof(char *)); if (nmatch_list == NULL) { free(match_list); return NULL; } match_list = nmatch_list; } match_list[++matches] = retstr; } if (!match_list) return NULL; /* nothing found */ /* find least denominator and insert it to match_list[0] */ which = 2; prevstr = match_list[1]; max_equal = strlen(prevstr); for (; which <= matches; which++) { for (i = 0; i < max_equal && prevstr[i] == match_list[which][i]; i++) continue; max_equal = i; } retstr = malloc(max_equal + 1); if (retstr == NULL) { free(match_list); return NULL; } (void)strncpy(retstr, match_list[1], max_equal); retstr[max_equal] = '\0'; match_list[0] = retstr; /* add NULL as last pointer to the array */ match_list[matches + 1] = (char *) NULL; return (match_list); } /* * Sort function for qsort(). Just wrapper around strcasecmp(). */ static int _fn_qsort_string_compare(const void *i1, const void *i2) { const char *s1 = ((const char * const *)i1)[0]; const char *s2 = ((const char * const *)i2)[0]; return strcasecmp(s1, s2); } /* * Display list of strings in columnar format on readline's output stream. * 'matches' is list of strings, 'len' is number of strings in 'matches', * 'max' is maximum length of string in 'matches'. */ void fn_display_match_list (EditLine *el, char **matches, size_t len, size_t max) { size_t i, idx, limit, count; int screenwidth = el->el_term.t_size.h; /* * Find out how many entries can be put on one line, count * with two spaces between strings. */ limit = screenwidth / (max + 2); if (limit == 0) limit = 1; /* how many lines of output */ count = len / limit; if (count * limit < len) count++; /* Sort the items if they are not already sorted. */ qsort(&matches[1], (size_t)(len - 1), sizeof(char *), _fn_qsort_string_compare); idx = 1; for(; count > 0; count--) { for(i = 0; i < limit && matches[idx]; i++, idx++) (void)fprintf(el->el_outfile, "%-*s ", (int)max, matches[idx]); (void)fprintf(el->el_outfile, "\n"); } } /* * Complete the word at or before point, * 'what_to_do' says what to do with the completion. * \t means do standard completion. * `?' means list the possible completions. * `*' means insert all of the possible completions. * `!' means to do standard completion, and list all possible completions if * there is more than one. * * Note: '*' support is not implemented * '!' could never be invoked */ int fn_complete(EditLine *el, char *(*complet_func)(const char *, int), char **(*attempted_completion_function)(const char *, int, int), const char *word_break, const char *special_prefixes, const char *(*app_func)(const char *), size_t query_items, int *completion_type, int *over, int *point, int *end) { const LineInfo *li; char *temp, **matches; const char *ctemp; size_t len; int what_to_do = '\t'; int retval = CC_NORM; if (el->el_state.lastcmd == el->el_state.thiscmd) what_to_do = '?'; /* readline's rl_complete() has to be told what we did... */ if (completion_type != NULL) *completion_type = what_to_do; if (!complet_func) complet_func = fn_filename_completion_function; if (!app_func) app_func = append_char_function; /* We now look backwards for the start of a filename/variable word */ li = el_line(el); ctemp = (const char *) li->cursor; while (ctemp > li->buffer && !strchr(word_break, ctemp[-1]) && (!special_prefixes || !strchr(special_prefixes, ctemp[-1]) ) ) ctemp--; len = li->cursor - ctemp; #if defined(__SSP__) || defined(__SSP_ALL__) temp = malloc(len + 1); #else temp = alloca(len + 1); #endif (void)strncpy(temp, ctemp, len); temp[len] = '\0'; /* these can be used by function called in completion_matches() */ /* or (*attempted_completion_function)() */ if (point != 0) *point = (int)(li->cursor - li->buffer); if (end != NULL) *end = (int)(li->lastchar - li->buffer); if (attempted_completion_function) { int cur_off = (int)(li->cursor - li->buffer); matches = (*attempted_completion_function) (temp, (int)(cur_off - len), cur_off); } else matches = 0; if (!attempted_completion_function || (over != NULL && !*over && !matches)) matches = completion_matches(temp, complet_func); if (over != NULL) *over = 0; if (matches) { int i; size_t matches_num, maxlen, match_len, match_display=1; retval = CC_REFRESH; /* * Only replace the completed string with common part of * possible matches if there is possible completion. */ if (matches[0][0] != '\0') { el_deletestr(el, (int) len); el_insertstr(el, matches[0]); } if (what_to_do == '?') goto display_matches; if (matches[2] == NULL && strcmp(matches[0], matches[1]) == 0) { /* * We found exact match. Add a space after * it, unless we do filename completion and the * object is a directory. */ el_insertstr(el, (*app_func)(matches[0])); } else if (what_to_do == '!') { display_matches: /* * More than one match and requested to list possible * matches. */ for(i=1, maxlen=0; matches[i]; i++) { match_len = strlen(matches[i]); if (match_len > maxlen) maxlen = match_len; } matches_num = i - 1; /* newline to get on next line from command line */ (void)fprintf(el->el_outfile, "\n"); /* * If there are too many items, ask user for display * confirmation. */ if (matches_num > query_items) { (void)fprintf(el->el_outfile, "Display all %zu possibilities? (y or n) ", matches_num); (void)fflush(el->el_outfile); if (getc(stdin) != 'y') match_display = 0; (void)fprintf(el->el_outfile, "\n"); } if (match_display) fn_display_match_list(el, matches, matches_num, maxlen); retval = CC_REDISPLAY; } else if (matches[0][0]) { /* * There was some common match, but the name was * not complete enough. Next tab will print possible * completions. */ el_beep(el); } else { /* lcd is not a valid object - further specification */ /* is needed */ el_beep(el); retval = CC_NORM; } /* free elements of array and the array itself */ for (i = 0; matches[i]; i++) free(matches[i]); free(matches); matches = NULL; } #if defined(__SSP__) || defined(__SSP_ALL__) free(temp); #endif return retval; } /* * el-compatible wrapper around rl_complete; needed for key binding */ /* ARGSUSED */ unsigned char _el_fn_complete(EditLine *el, int ch __attribute__((__unused__))) { return (unsigned char)fn_complete(el, NULL, NULL, break_chars, NULL, NULL, 100, NULL, NULL, NULL, NULL); }